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' T. B. -CLA,TWORTHY..

PIPE GOUPLING'. Y No. 269,011. Patented Dec. 12, 1882.

bz afweer M XM i. annular sockets, in which the ends ofthe pipe i I been made entirely of cast-iron.

UNITED STATES PATENT OEErcE.

THOMAS B. OLATWORTHY, OF NEW YORK, N. Y., ASSIGNOR TO ABENDROTH & ROOT MANUFACTURING COMPANY, OF SAME PLACE.

PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 269,011, dated December 12, 1882.

(No modcLl To all whom 'it may concern Be it known `that I, THOMAS B. GLATWOR- THY, of the city of New York, in the county and State of New York, have invented a new and useful Improvement in Pipe-Oouplings, of which the following is a specitication.

My invention is more especially designed for use with sheet-iron pipe for hydraulic purposes, in which thejoints are calked with lead or other packing material; and it relates to couplings which are composed of inner and outer rings and a connecting-ange between the ends of the rings, whereby are formed two are secured bycalking. These couplings have Such castiron couplings are, however, objectionable, be-

cause in order to give the inner ring the.

strength desired to resist blows in calking it must be so thick and heavy that it will materially reduce the caliber of the pipe.

The object of my invention is to remedy this and other defects; and to these ends the in vention consists in a coupling composed ofan inner ring of wrought-iron and an outer ring of cast-iron, having aninternal flange, which is secured by casting upon the inner ring, thereby torming two annular sockets for the reception ofthe pipe. The outer ring is preferably cnned or tapered in reverse directions internally, so as to form dovetailed' or` undercut sockets.

In the accompanying drawings, Figure 1 represents a central lsection lof my improved coupling alone; and FigZ represents asimilar section ofthe coupling, showing the pipes secured therein.

Similar letters of reference designate corresponding parts in both figures.

A B designate respectively the inner and outer rings ofthe coupling; and B designates the internal. flange which unites said rings between their ends, thereby forming two annular sockets, C. The inner ring, A, is made of wroughtiron, and may consist of a piece of ordinary tubing, or made ofsheet-iron, and riveted or otherwise formed. The two rings are secured together by placing the inner ring in a suitable mold and casting the outer ring about it. The iiauge B will in cooling con 5o tract tightly upon `the inner ring, and, if desired, the exterior of the inner ring may be grooved crroughened, as ata, to make its union with the iiange inre secure.

The sockets O are undercut or dovetailed,

being largest at the bott0m,and theinner ring is longer than the outer 0ne,sothatit projects beyond the same at each end.

In connecting the pipes D their ends are inserted in the sockets C, and the lead or other 6c ing material cannot get loose and get out. The i inner ring, being of wrought-iron, may be so thin that it will not materially reduce the caliber of the pipe, and still will afford the pipe 7o adequate support.

Vhat I claim as my invention, and desire to secure by Letters Patent, is l 1. The pipe-coupling composed of an inner ring of wrought-iron and an outer ring of castiron, having an internal flangehwhich is secured by casting upon the inner ring, thereby forming two annular sockets for the reception of the pipe, substantially as described.

2. The pipe-coupling composed of an inner 8o ring of wrought-iron and an outer ringof castiron, coned or tapered internally and having an internal ange,which is secured by casting upon the inner ring, thereby forming two an nular dovetailed sockets for the reception of the pipe, substantially as described.

T. B. OLATWORTHY. Witnesses:

\ FREDK-HAYNEs,

E. L. MORAN.

The sock- 65 

